Battery charging circuit

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries


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320 35, H02J 704




The invention relates to a fast charge circuit suitable for use with battery cells which can be charged at a 4C rate. Line voltage is transformed, full wave rectified and applied to the battery pack. A pair of voltage comparators monitor a sensing voltage which is indicative of the charging voltage and the trough voltage of the battery cells. During a "window" when the sensing voltage is less than a predetermined threshold and through voltage exceeds this threshold, the comparators indicate that charging should be terminated. Alternatively, if excessive temperature on the cells is detected or a selected amount of time passes without reaching full charge, fast charging is also terminated. After the fast charging interval trickle charging of the cells is employed to bring the battery pack to full charge and maintain it there.

patent: 3855516 (1974-12-01), Fairchild
patent: 4140958 (1979-02-01), Groeschel
patent: 4210855 (1980-07-01), Harer et al.
patent: 4240022 (1980-12-01), Kilinskis et al.
patent: 4349775 (1982-09-01), Kwon et al.


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